<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
  </head>
  <body>
    <h2>Level 1</h2>
    <h3>Level 2</h3>
    <h4>Level 3</h4>
    <h5>Level 4</h5>
    <h6>Level 5</h6>
    <div role="heading" aria-level="7">Level 6</div>
    <div role="heading" aria-level="8">Level 7</div>
  </body>
</html>
